console.log('02的开始------')
export let i = 200 //单独导出
let j = 200

function add(m, n) {
  return m + n
}

let o = {
  age: 18,
}

//不能再这里再导出i,因为i已经单独导出过了
//export {j,add as sum,i}

export { j, add as sum, o } //集中导出
console.log('02的结束--------')
